错误代码为24909，请问出错原因，谢谢！在线等待

ccrazy

在pro*c中调用数据库，sqlca.sqlcode=24909，错误解释如下：
24909, 00000, "call in progress. Current operation cancelled"
// *Cause: The OCI call was invoked when another call on the connection was
//         in progress.
// *Action: Check if the OCI call is supported when the call is in progress
//          under special conditions; for example, if it is being used by a
//          signal handler.


看不明白，请问大侠们出错原因到底是什么？谢谢！